Skimming vs re-plastering: which do I actually need?
How to tell whether your walls just need a fresh skim or a proper re-plaster back to brick — and what each one costs.
This is one of the most common confusions when people ring up for a quote. "Do I need plastering or just skimming?" Honest answer — most of the time, just a skim. But not always, and getting it wrong costs you money either way.
What skimming actually is
Skimming is a thin (about 2–3mm) finish coat of fine plaster applied over an existing sound surface. It's what gives you a smooth, paint-ready wall. Done over good underlying plaster it's quick, clean and looks brand new.
If your walls are basically flat and solid but look tired, patched, or have wallpaper marks, skimming is what you want.
What re-plastering is
Re-plastering means hacking off the existing plaster back to the bare brick or block, applying an undercoat plaster to build the thickness back up (about 8–11mm), then finishing with a skim on top. It's the full job — and it's what you need if the old plaster has failed.
How to tell which one you need
Tap the wall with your knuckles. A solid, dull thud means the plaster is still bonded to the brick — a skim will be fine. A hollow, drum-like sound means the plaster has come away from the wall behind. Skimming over it is a waste of money — it'll all come down together eventually.
Other signs you need a full re-plaster: large cracks that keep coming back, bulges in the wall, areas where the plaster crumbles when you press it, or damp damage that's gone through to the substrate.
If only a small patch is blown, sometimes we can cut that bit out, re-plaster just that area, and skim over the whole wall to even it up. Always cheaper than doing the lot.
Which costs more?
Re-plastering is usually 2–3 times the price of skimming, because there's a lot more labour, materials and waste involved. For a rough idea, see our full 2026 plastering price guide.
What I'd tell a mate
Don't pay to re-plaster a wall that doesn't need it. And don't skim over blown plaster to save money short-term — you'll be paying twice within a year. If you're not sure, get someone round to look. I do free quotes across all of Yorkshire — Leeds, Bradford, Wakefield, York, Sheffield, the lot.
Frequently asked
- Can you re-plaster just one wall?
- Yes, no problem. We'll often re-plaster one bad wall and skim the others in the same room so everything matches.
- Will I be able to tell the difference once it's painted?
- No. Once a skim coat is on and painted, a re-plastered wall and a skimmed wall look identical.